A heading in a template

What a template reads on each heading in page.toc, and in each heading’s headings.

title

The heading’s words, as plain text.

id

The id of the heading’s element.

url

A link to the heading on its page: # followed by its id.

level

The heading’s level, from 1 for a # heading to 6.

headings

The headings under this one, each with the same values as a heading in page.toc. Empty if there are none.